Thulium-175

Properties and data of the isotope ¹⁷⁵Tm.

Contents

General data

Name of the isotope:Thulium-175; Tm-175Symbol:¹⁷⁵Tm or 17569TmMass number A:175 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:106Isotopic mass:174.94384(5) u (atomic weight of Thulium-175)Nuclide mass:174.9059914 u (calculated nuclear mass without electrons)Mass excess:-52.3127 MeVMass defect:1.514568304 u (per nucleus)Nuclear binding energy:1410.81128777 MeV (per nucleus)
8.06177879 MeV (average binding energy per nucleon)Separation energy:S_N = 6.52(7) MeV (first neutron)
S_P = 7.65(30) MeV (first proton)Half-life:15.2(5) minDecay constant λ:0.00076002980324555 s^-1Specific activity α:2.630463524652 × 10⁺¹⁸ Bq g^-1
71093608.774381 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)Year of discovery:1961

Radioactive Decay

Half-life T_½ = 15.2(5) min (minutes) respectively 9.12 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁷⁵Yb	100 %	2.38(5) MeV

Parent Nuclides

Direct parent isotope is: ¹⁷⁵Er.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 175) with Thulium-175. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 106	Isobar A = 175
64	¹⁷⁰Gd
65	¹⁷¹Tb
66	¹⁷²Dy
67	¹⁷³Ho	¹⁷⁵Ho
68	¹⁷⁴Er	¹⁷⁵Er
69	¹⁷⁵Tm	¹⁷⁵Tm
70	¹⁷⁶Yb	¹⁷⁵Yb
71	¹⁷⁷Lu	¹⁷⁵Lu
72	¹⁷⁸Hf	¹⁷⁵Hf
73	¹⁷⁹Ta	¹⁷⁵Ta
74	¹⁸⁰W	¹⁷⁵W
75	¹⁸¹Re	¹⁷⁵Re
76	¹⁸²Os	¹⁷⁵Os
77	¹⁸³Ir	¹⁷⁵Ir
78	¹⁸⁴Pt	¹⁷⁵Pt
79	¹⁸⁵Au	¹⁷⁵Au
80	¹⁸⁶Hg	¹⁷⁵Hg
81	¹⁸⁷Tl
82	¹⁸⁸Pb
83	¹⁸⁹Bi
84	¹⁹⁰Po
85	¹⁹¹At